Figure REF c displays the opacity \(\kappa _{\mathrm {dust,\,H}\,\alpha }\)  as a function of \(f_{\textrm {d/g}}\) .
We consider that a range of \(f_{\textrm {d/g}}\sim 10^{-5}\) –\(3\times 10^{-4}\)  is plausible given the relative depletion by a factor of 100–1000 found by [1]} and spatial variations (on scales larger than planets' Hill spheres, as the results of [2]} suggest).
